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LTV (Lifetime Value) is the total amount of money a customer brings to a business over the entire relationship, not just the first order. Unlike CAC, which measures the cost of winning a customer, LTV measures the actual benefit that customer delivers over time — and it's the number that tells you whether a marketing budget is truly worth spending.
A business that looks only at the first order risks cutting exactly the channels that, over the medium term, bring the most profitable customers. LTV corrects that narrow view and shifts the budget decision from "how much does a customer cost" to "how much is a customer worth".
For anyone running Google Ads or Meta Ads campaigns, LTV becomes useful once it's compared against CAC (Customer Acquisition Cost) — together the two metrics show the real sustainability of an acquisition channel.
LTV formula and its variants
The simple version, suited to businesses with repeat purchases (online stores, subscription services, clinics, auto service shops):
LTV = Average order value × Average number of orders per year × Average customer relationship length (years)
For subscription businesses, the formula simplifies to average monthly revenue per customer, divided by the monthly churn rate:
LTV = Average monthly revenue per customer / Monthly churn rate
Both versions are orientative — they use historical averages to estimate future behavior, not a guaranteed value for each individual customer.
Numeric example of LTV calculation
An online auto parts store has the following average customer data:
- Average order value: 36 EUR
- Average number of orders per year per customer: 3
- Average customer relationship length: 2 years
LTV = 36 EUR × 3 × 2 = 216 EUR per customer.
If the CAC for this store is 40 EUR, the LTV:CAC ratio is roughly 5.4:1 — a sustainable acquisition channel. If LTV had been calculated only from the first order (36 EUR), a CAC of 40 EUR would have looked like a loss, even though the customer is profitable over the medium term.
LTV vs CAC — the ratio that decides the marketing budget
- CAC shows how much it costs to bring in a new customer, per channel and per period.
- LTV shows how much that customer brings over the entire relationship, not just the first purchase.
- The LTV:CAC ratio of at least 3:1 is commonly used in the industry as an orientative sustainability threshold — a ratio below this level signals an expensive channel relative to the value it actually delivers.
A very high ratio (above 8-10:1) isn't always a good sign — it can point to an overly cautious acquisition budget that leaves profitable customers untapped for competitors to reach.
How to grow LTV without pushing prices up
- Loyalty programs and discounts for repeat orders, which increase the average number of orders per year per customer.
- Retargeting existing customers for cross-sell, not only for acquiring new customers.
- Recurring communication (email, remarketing) that keeps the relationship active between purchases, not just right after the first order.
- Improving the post-purchase experience (delivery, support, warranty), which directly influences whether a customer returns.
- Segmenting customers by actual value, to allocate retention budget where LTV is already high, not uniformly across the entire customer base.
Common mistakes in LTV calculation
- Calculating LTV from the first order only, ignoring the repeat purchase pattern specific to the business model.
- Using an unrealistic average relationship length, without checking it against the business's actual historical data.
- Comparing LTV against CAC from different periods, without adjusting for seasonality or price changes.
- Treating LTV as a fixed value per customer, when it varies significantly between segments (occasional vs loyal customers).
HappyWeb's practical tip for tracking LTV
We recommend calculating LTV separately per customer segment (from Google Ads, Meta Ads, referrals), not only at the aggregate business level. A good average LTV can hide a channel that brings low-value customers, offset by another with loyal, long-term customers — splitting by channel shows exactly where the retention budget is worth investing.
Frequently asked questions about LTV
What LTV:CAC ratio is considered good?
A ratio of at least 3:1 is used orientatively in the industry as a sustainability threshold, but the right value depends on profit margin and industry.
Is LTV calculated the same way for every type of business?
No. Businesses with repeat purchases (retail, services) use the formula based on order value, frequency and relationship length, while subscription businesses use the formula based on monthly revenue and churn rate.
How often should LTV be recalculated?
Orientatively, every quarter or whenever major changes occur in pricing, product, or customer behavior, so the number stays relevant for current budget decisions.
Why does LTV differ between acquisition channels?
Customers from different channels (Google Ads, Meta Ads, referrals) often have different return behavior and order value, which makes average LTV vary significantly by channel.
Conclusion: LTV moves the budget decision past the first order
LTV doesn't replace CAC, it completes it: together, the two metrics show whether an acquisition channel is truly profitable over the medium term, not just cheap at first glance. Calculated correctly and tracked by segment, LTV becomes the concrete argument for investing more where customers actually come back.
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